Still River Estates Subdivision
EPA ID: MT0005118 · 188 people served · 2 ZIP codes
ZipCheckup's reading of EPA SDWIS for Still River Estates Subdivision (MT0005118): 1 past health-based violation, since resolved. Although 26 violations appeared on Still River Estates Subdivision's record, all have been remedied - currently compliant, 188 served.
Data: EPA SDWIS
Service Area Map
Coverage area for Still River Estates Subdivision Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Still River Estates Subdivision serves a community with a median household income of $90,270 and an estimated 62,029 residents across its service area. Approximately 44% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Still River Estates Subdivision's water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
Wastewater Proximity Note: This service area ranks in the 60th percentile nationally for proximity to wastewater discharge points.
Superfund Proximity Note: This service area ranks in the 70th percentile nationally for proximity to Superfund (NPL) sites. Groundwater sources near contaminated sites may face elevated risk from industrial chemicals.
Infrastructure Risk
Detected Contaminants
How Still River Estates Subdivision compares to EPA limits
What This Means For You
PFOA at 1 mg/L exceeds the EPA maximum of 0.000004 mg/L.
PFNA at 1 mg/L exceeds the EPA maximum of 0.00001 mg/L.
Chlorodibromomethane at 1 mg/L exceeds the EPA maximum of 0.002 mg/L. Liver cancer, brain cancer (known carcinogen). Consider granular activated carbon (GAC) filtration.
Arsenic at 3 mg/L exceeds the EPA maximum of 0.01 mg/L.
Bromate at 1 mg/L exceeds the EPA maximum of 0.01 mg/L.
Chlorodibromomethane was detected in this water system. granular activated carbon (GAC) filtration can reduce exposure.
Find a certified water filter →Comparable Water Systems
Similar-sized systems in Montana
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
Still River Estates Subdivision (EPA ID: MT0005118) is a community water system in Montana that serves approximately 188 people from groundwater sources.
This system provides water to 2 ZIP codes across 1 community.
Violation History
Status breakdown for accepted records with record years 2021-2026: 25 resolved, 1 archived, 0 addressed, and 0 unaddressed. Under this source contract, current noncompliance is the sum of addressed and unaddressed records. Archived and resolved records are excluded from current noncompliance.
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| May 1, 2026 | Arsenic | Non-health-based | Resolved |
| January 1, 2025 | Stage 1 DBP Rule | Non-health-based | Resolved |
| January 1, 2025 | PFOA | Non-health-based | Resolved |
| January 1, 2025 | PFNA | Non-health-based | Resolved |
| January 1, 2025 | Monochloroacetic Acid | Non-health-based | Resolved |
| January 1, 2025 | Dichloroacetic Acid | Non-health-based | Resolved |
| January 1, 2025 | Bromodichloromethane | Non-health-based | Resolved |
| January 1, 2025 | Dibromochloromethane | Non-health-based | Resolved |
| January 1, 2025 | Bromoform | Non-health-based | Resolved |
| January 1, 2025 | Chlorodibromomethane | Non-health-based | Resolved |
| January 1, 2025 | Trichloroacetic Acid | Non-health-based | Resolved |
| January 1, 2025 | Monobromoacetic Acid | Non-health-based | Resolved |
| January 1, 2025 | Dibromoacetic Acid | Non-health-based | Resolved |
| January 1, 2025 | Bromochloroacetic Acid | Non-health-based | Resolved |
| January 1, 2025 | Bromodichloroacetic Acid | Non-health-based | Resolved |
| January 1, 2025 | Chlorodibromoacetic Acid | Non-health-based | Resolved |
| January 1, 2025 | Tribromoacetic Acid | Non-health-based | Resolved |
| January 1, 2025 | HAA6Br | Non-health-based | Resolved |
| January 1, 2025 | HAA9 | Non-health-based | Resolved |
| January 1, 2025 | Bromate | Non-health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Arsenic | Inorganic | 3 | Yes |
| Stage 1 DBP Rule | Treatment Failure | 2 | No |
| PFOA | PFAS | 1 | No |
| PFNA | PFAS | 1 | No |
| Monochloroacetic Acid | Disinfection Byproducts | 1 | No |
| Dichloroacetic Acid | Disinfection Byproducts | 1 | No |
| Bromodichloromethane | Disinfection Byproducts | 1 | No |
| Dibromochloromethane | Disinfection Byproducts | 1 | No |
| Bromoform | Disinfection Byproducts | 1 | No |
| Chlorodibromomethane | Disinfection Byproducts | 1 | No |
| Trichloroacetic Acid | Disinfection Byproducts | 1 | No |
| Monobromoacetic Acid | Disinfection Byproducts | 1 | No |
| Dibromoacetic Acid | Disinfection Byproducts | 1 | No |
| Bromochloroacetic Acid | Disinfection Byproducts | 1 | No |
| Bromodichloroacetic Acid | Disinfection Byproducts | 1 | No |
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0 mg/L | No | N/A |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by MT or modeled from parcel and building-footprint data.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Still River Estates Subdivision (MT0005118) on EPA.gov.
Frequently Asked Questions
Is Still River Estates Subdivision water safe to drink?
The accepted 2026Q2 ECHO snapshot shows no current noncompliance for Still River Estates Subdivision; its 26 accepted 2021-2026 records are resolved or archived. Historical compliance status does not establish conditions at a specific tap.
How many people does Still River Estates Subdivision serve?
Still River Estates Subdivision serves approximately 188 people across 2 ZIP codes in Montana.
Where does Still River Estates Subdivision get its water?
The primary water source is groundwater.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Still River Estates Subdivision (MT): 1 Health Violation. https://zipcheckup.com/water-system/mt0005118/
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author = {{ZipCheckup}},
title = {{Still River Estates Subdivision (MT): 1 Health Violation}},
year = {n.d.},
url = {https://zipcheckup.com/water-system/mt0005118/}
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What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Still River Estates Subdivision (EPA ID: MT0005118) - request the latest Consumer Confidence Report or ask about specific contaminants.